Umbrella



FIG. 1 is a bottom perspective view of an umbrella, shown in the open position;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a side elevation view of the umbrella, shown in a closed position;

FIG. 5 is a side elevation view of the umbrella, shown in a partially closed position;

FIG. 6 is a side elevation view of FIG. 1; and,

FIG. 7 is an enlarged perspective view of the central region of the umbrella, shown in the open position.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an umbrella, as shown and described. 